51316451565 has 32 divisors (see below), whose sum is σ = 83900468736. Its totient is φ = 26771381760.

The previous prime is 51316451521. The next prime is 51316451581. The reversal of 51316451565 is 56515461315.

It is not a de Polignac number, because 51316451565 - 2²⁶ = 51249342701 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1292449 + ... + 1331561.

It is an arithmetic number, because the mean of its divisors is an integer number (2621889648).

Almost surely, 2^51316451565 is an apocalyptic number.

It is an amenable number.

51316451565 is a deficient number, since it is larger than the sum of its proper divisors (32584017171).

51316451565 is a wasteful number, since it uses less digits than its factorization.

51316451565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41029.

The product of its digits is 270000, while the sum is 42.

The spelling of 51316451565 in words is "fifty-one billion, three hundred sixteen million, four hundred fifty-one thousand, five hundred sixty-five".